That's good for Vic. Apparently all that investigation turned up was an incident with a jelly bean and a dad joke. Hardly harassment. (In fact, Monica Rial has confirmed this.)
And they don't get to bring in any witnesses because they aren't relevant to the defendants' defamation. Correction: The defendants CAN bring in witnesses, but only to corroborate their allegations. They can't take the stand and use their own accusations as evidence against Vic because those allegations aren't relevant to the defamation.